Fault Code 4266

Fault Code 4266

Return pump fault
Return pump voltage and motor relay voltage actual values are evaluated and display implausible values

Diagnostic conditions
- Vehicle speed is greater than 6 km/h

Possible cause of fault
- Short or open circuit in the B+/ground supply to hydraulic unit
- Return pump motor locked up/runs too easily
- Hydraulic unit faulty

Affected pins
Pin 1 and pin 2

Diagnosis/troubleshooting